import React, {Component} from 'react';

//引入connect用于连接UI组件与redux
import {connect} from 'react-redux'
import {createDecrementAction, createIncrementAction, createIncrementAsyncAction} from "../../redux/count_action";

/*
    1,mapStateToProps函数返回的是一个对象；
    2,返回的对象中的key就作为传递给UI组件props的key,value就作为传递给UI组件props的value
    3,mapStateToProps用于传递状态
*/
/* const mapStateToProps = state => ({count: state}) */

/*
    1.mapDispatchToProps函数返回的是一个对象；
    2.返回的对象中的key就作为传递给UI组件props的key,value就作为传递给UI组件props的value
    3.mapDispatchToProps,用于传递操作状态的方法
*/
/* const mapDispatchToProps = dispatch => (
    {
        countAdd: number => dispatch(createIncrementAction(number)),
        countSub: number => dispatch(createDecrementAction(number)),
        countAsyncAdd: (number, time) => dispatch(createIncrementAsyncAction(number, time))
    }
)
*/

class Count extends Component {
    // 加法
    increment = () => {
        const {value} = this.selectNumber
        this.props.countAdd(value * 1)
    }
    // 减法
    decrement = () => {
        const {value} = this.selectNumber
        this.props.countSub(value * 1)

    }
    // 奇数加
    incrementIfOdd = () => {
        const {value} = this.selectNumber
        if (this.props.count % 2 !== 0) {
            this.props.countAdd(value * 1)
        }

    }
    // 异步加
    incrementAsync = () => {
        const {value} = this.selectNumber
        this.props.countAsyncAdd(value * 1, 1000)
    }

    render() {
        return (
            <div>
                <h1>当前求和为：{this.props.count}</h1>
                <select ref={c => this.selectNumber = c}>
                    <option value="1">1</option>
                    <option value="2">2</option>
                    <option value="3">3</option>
                </select>
                <button onClick={this.increment}>+</button>
                &nbsp;
                <button onClick={this.decrement}>-</button>
                &nbsp;
                <button onClick={this.incrementIfOdd}>当前求和为奇数再加</button>
                <button onClick={this.incrementAsync}>异步加</button>
                &nbsp;
            </div>
        );
    }

}


// 创建暴露一个容器组件
export default connect(
    state => ({count: state}),
    // 一般写法
    /*    dispatch => ({
            countAdd: number => dispatch(createIncrementAction(number)),
            countSub: number => dispatch(createDecrementAction(number)),
            countAsyncAdd: (number, time) => dispatch(createIncrementAsyncAction(number, time))
        })*/
    // 简写
    {
        countAdd: createIncrementAction,
        countSub: createDecrementAction,
        countAsyncAdd: createIncrementAsyncAction
    }
)(Count)

